Question: 1 2 . Find context - free grammars for the following languages ( with n > = 0 , m > = 0 , k

12. Find context-free grammars for the following languages (with n >=0,
m >=0, k >=0):
a. L ={a
nb
mc
k
: n = m or m <= k}.
b. L ={a
nb
mc
k
: n = m or m = k}.
c. L ={a
nb
mc
k
, k = n + m}.
d. L ={a
nb
mc
k
, k =|n m|}.
e. L ={a
nb
mc
k
, k = n +2m}.
f. L ={a
nb
mc
k
, k != n + m}.

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